rs267608688

Variant names:

• chr12-106433739-C-A
• rs267608688
• NM_018082.6:c.1648C>A

Your query was ambiguous. Multiple possible variants found:

• chr12-106433739-C-A
• chr12-106433739-C-G
• chr12-106433739-C-T

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_018082.6(POLR3B):​c.1648C>A​(p.Arg550Arg) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,052 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: POLR3B NM_018082.6 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.68
• Publications: 4 publications found

Genes affected

POLR3B (HGNC:30348): (RNA polymerase III subunit B) This gene encodes the second largest subunit of RNA polymerase III, the polymerase responsible for synthesizing transfer and small ribosomal RNAs in eukaryotes. The largest subunit and the encoded protein form the catalytic center of RNA polymerase III. Mutations in this gene are a cause of hypomyelinating leukodystrophy. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Dec 2011]

POLR3B Gene-Disease associations (from GenCC):

• neurodevelopmental disorder

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG Submitted by: G2P
• hypomyelinating leukodystrophy 8 with or without oligodontia and-or hypogonadotropic hypogonadism

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Illumina, Labcorp Genetics (formerly Invitae)
• Charcot-Marie-Tooth disease, demyelinating, IIA 1I

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• endosteal sclerosis-cerebellar hypoplasia syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• hypomyelination-hypogonadotropic hypogonadism-hypodontia syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.21).
• BP7: Synonymous conserved (PhyloP=1.68 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POLR3B	NM_018082.6	c.1648C>A	p.Arg550Arg	synonymous_variant	Exon 16 of 28	ENST00000228347.9	NP_060552.4
POLR3B	NM_001160708.2	c.1474C>A	p.Arg492Arg	synonymous_variant	Exon 16 of 28		NP_001154180.1
POLR3B	XM_017019621.3	c.1648C>A	p.Arg550Arg	synonymous_variant	Exon 16 of 26		XP_016875110.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
POLR3B	ENST00000228347.9	c.1648C>A	p.Arg550Arg	synonymous_variant	Exon 16 of 28	1	NM_018082.6	ENSP00000228347.4
POLR3B	ENST00000539066.5	c.1474C>A	p.Arg492Arg	synonymous_variant	Exon 16 of 28	2		ENSP00000445721.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461052 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 726850

African (AFR) AF: 0.00 AC: 0 AN: 33454

American (AMR) AF: 0.00 AC: 0 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26124

East Asian (EAS) AF: 0.00 AC: 0 AN: 39654

South Asian (SAS) AF: 0.00 AC: 0 AN: 86218

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53152

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5744

European-Non Finnish (NFE) AF: 9.00e-7 AC: 1 AN: 1111642

Other (OTH) AF: 0.00 AC: 0 AN: 60348

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000209 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.21
CADD	Benign	11
DANN	Benign	0.63
PhyloP100		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs267608688; hg19: chr12-106827517;